The easiest method I ever saw consisted of butting up the plasterboard
to the wall, ensuring it was vertical.
Then a pencil was passed through the centre on a thread bobbin. The
bobbin was pressed against the wall and slowly dragged down while the
pencil transferred the imperfections onto the plasterboard sheet.
A compass can be used in a similar fashion if the gaps are too big.
Paul Mc Cann
Like the thread bobbin method - cheap!
Incidentally, Axminster sell a really good pair of dividers for this
purpose - they're about 8" long and solidly built, with a locking screw so
that they don't move at all during the scribing operation.
I got sick of my old pair moving about mid-scribe...
email me at
richard at olifant d-ot co do-t uk
Why do you want to? If you are building a stud partition which is going to
be skimmed and which meets an existing wall, the plasterboard doesn't have
to meet exactly - the plaster will fill the gap.
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